20511522260 has 24 divisors (see below), whose sum is σ = 43211827176. Its totient is φ = 8178393600.

The previous prime is 20511522253. The next prime is 20511522263. The reversal of 20511522260 is 6222511502.

It can be written as a sum of positive squares in 4 ways, for example, as 139098436 + 20372423824 = 11794^2 + 142732^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20511522263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1632041 + ... + 1644560.

It is an arithmetic number, because the mean of its divisors is an integer number (1800492799).

Almost surely, 2^20511522260 is an apocalyptic number.

20511522260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20511522260 is an abundant number, since it is smaller than the sum of its proper divisors (22700304916).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20511522260 is a wasteful number, since it uses less digits than its factorization.

20511522260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3276923 (or 3276921 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The spelling of 20511522260 in words is "twenty billion, five hundred eleven million, five hundred twenty-two thousand, two hundred sixty".